M1 Carbine Recoil Plate Screw

I was working on my friends M1 it is an Inland and when i took out his Recoil Plate Screw i notice the Screw has the threads almost all they way up to right under the Top, So I took my 2 M1's and had the Screws that had the threads just about 1/2" and thats all. Has anyone seen a Recoil Plate Screw like this or is the one with just half an inch threads the different one,
:help:
Thanks

According to some notes in CC newsletters: Full thread--- Standard Products used both thru out production and Inland 1st block used some also. John

Thanks John....I was looking around and couldnt find nothing, even my parts book, didn't even see a full thread for sale.